Electrical signaling.



W. w. DEAN. ELECTRICAL SIGNALING.

APPLICATION FILED MAY 19, 1905.

1,125,490. w v Patented Ja11.19,1915.

1 mi TED STATES PATENT OFFICE.

WILLIAM W. DEAN, OF ELYRIA, OHIO; CURTIS B. CAMP, TRUSTEE, APPOINTED BYCOURT.

ELECTRICAL SIGNALING.

Specification of Letters Patent.

' Patented Jan. 19, 1915.

Application filed May 19, 1905. Serial No. 261,182.

more than one station is served over a single line, modern standardpractice calls for the empioyment of signaling means by which onestation. may be called up without alarm" ing the other, or-any of theothers, if there be several.

In former systems devised by me I have employed a number of tunedvibrating reeds at the several stations, each reed responding to acertain frequency of alternating or intermittent current only. The reedsemployed constituted the cla per rods of polarized ringers, and the cappers were adjusted to strike the gongs without the-armatures touchingthe pole pieces. 'Wi'th such an arrangement, the initial rate or periodof vibration of each clapper rod is somewhat modified by contact withthegongs, and hence I found it necessary to resort to undertuning orover-tuning the current or the mechanical parts, in order that thecurrent thrown upon the line to ring a. particular station shouldcorrespond in periodicity to the modified or operative periodicity ofthe reed and clapper at the desired sub-station. My present invention,while it includes the feature of a tuned reed at each'station, is animprovement in every way over, and is to be distinguished from my formerinventions b the following radically diiferent princip e and method ofoperation: In former cases I was forced to use gongs of different sizes,and it was necessary to have a very nice adjustment of relativefrequencies, as well as a careful adjustment of the moving mechanicalparts. In'the present case, I abandon all over-tuning and under-tuningentirely, and adjust my reed to respond to its own natural frequency,and this being determined, the current can be supplied at acorresponding frequency with absolute certainty.

In order to overcome the modifying effects of the gong strokes, I usethree 'expedients, first, I provide a very stiff spring mounting for thearmature and clapper rod, second, expose the armature to a cumulativeliyincreasin force as it vibrates, and thir I expose t e naked pole piecesto the ends of the armature, and so adjust the gongs that each end ofthe armature will strike its pole piece before the clapper touches thegong, the clapper then springing over to strike the gong, and thusgetting a very quick return. In practice the distance between theclapper and the gong may be say of an inch. With this construction andadjustment, I get a very sharp, clear and powerful tone from the gongs,and perfeet certainty of operation in selection.

It will be observed that my invention really covers a method as well asthe apparatus for practising the method. 'In the present case, I shallclaimthe apparatus only setting forth some specific features, such as aspring mounting of the armature and the means for tuning by sliding theclapper up and down the rod; but it is quite obvious that my method isindependent of these or any other specific limitations, beingpracticable with many different forms of apparatus and the same will bepresented and claimed in a separate application.

My invention will be fully understood upon reading the followingdetailed description, in connection with the accompanying drawings,forming a part hereof, in which Figure 1 is a side view of a polarizedsignal bell or ringer embodying my invention; .Fig. 2 is a section onthe line ww of Fig. 1, looking to the right; and Fig. 3 is a perspectiveview of the clapper rod with its connecte'd parts, removed.

Referring to the drawings, Q, is a pair of ringer magnets mounted uponthe yoke B, which also carries the bent permanent magnet M, as shown.The cores 9, q of the elec tromagnetsprotrude at the lower ends and uponthem, or upon the sleeve surrounding them is carried the armature yokeA. This is of nonmagnetic material, extending from pole to pole andadjustably clam Jed thereto, and. having front and back downwardiyturned extensions a, a, slotted as shown at a for the reception of thestuds, d, d on the clapper rod, while the two body portions projectoppositely and in the same plane to form the armature, substantially asdescribed.

2. In an electric bell, a T shaped armature and clapper rod composed oftwo L shaped members formed integral and having their stems securedtogether, substantially as described.

3. A vibrator for electroma ets comprising a supporting spring, am? apair of L shaped members each having a broad body, a drop leaf, and anextended tongue, the two tongues being secured together to form thevibrator, the two drop leaves being secured together on opposite sidesof the spring to form the support, and the two broad bodies extending inopposite directions and transversely to the spring to form the armature,substantially as described.

i. In a harmonic ringer, an electromagnet, a gong, an armature clapperrod and clapper rigidly associated, such armature adapted to be operatedby such electromagnet to cause such clapper to strike the gong, a yokesup ported by such electromagnet, means for supporting and pivoting sucharmature consisting in a prismatic spring provided with end clamps forsupporting it from such yoke, such spring adapted when suchelectromagnet is not energized to maintain such clapper in properposition relatively to such gong, and such end clamps adapted to per mitadjustment of such spring relatively to such yoke. j

5. In a ringer, a pair of electromagnets, a pair of gongs, aframe forrigidly associating such electromagnets and gongs, an armature adaptedto be operated by such electromagnets, a clapper rod and clapper rigidlyassociated with such armature, a non-magnetic yoke supported from theoperating ends of such electromagnets, means for supporting and pivotingsuch armature consisting in a prismatic spring provided with end clampsfor supporting it from such yoke, such spring adapted when suchelectromagnets are not energized to maintain such clapper out ofengagement with such gongs and such end clamps adapted to permitadjusktment of such spring relatively to such yo e.

6.. Means for adjusting the armature and clapper rod of an electric bellwhich comprise a rigid yoke secured upon the frame of the bell, atransverse member secured to the armature and clapper rod and supportedby such yoke, means for efiecting adjustment of such transverse memberlaterally thereof in such yoke, and means for locking such member in adesired adjustment.

7. Means for adjusting the armature and clapper rod of an electric bellwhich comprise a rigid yoke secured upon the frame of the bell, atransverse member secured to the armature and clapper rod and supportedby such yoke, means for effecting angular adjustment of such transversemember in such yoke to adjust the air gaps of the armature, and meansfor locking such member in a desired adjustment.

In testiinon whereof I aflix my signature in presence 0 two witnesses.

WILLIAM W. DEAN Witnesses:

A. D. T. LIBBY, SIDNEY A. BEYLAND.

